Typewriting machine



Nov. 17, 1925.

J. A. B. SMITH TYPEWRITING momma s Sheets-Sheet 1 Filed Sept. '7, 1923 Nov. 17, 1925- J. A. B. SMITH TYPE-WRITING MACHINE Filed Sept. 7, 1923 3 Sheets-Sheet 2 Nov. 17, 1925- J. A. B. SMITH TYPEWRITING MACHINE Filed Sept. 7, 1923 3 Sheets-Sheet 5 Patented Nov. 17, 1925.

UNITED STATES PATENT OFFICE.

JESSE A. B. SMITH, OF'STAMFORI), CONNECTICUT, ASSIGNOIB, TO UNDERWOOD 'IY PE- .WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Application filed September 7, 1923. Serial No; 661,364.

To all whom, it may concern:

Be it known that I, JEssE A. B. SMITH, a citizen of the United States, residing in Stamford, in the county of Fairfield and State of Connecticut, have invented Certain new and useful Improvements in Typewriting Machines,- of which the following is a specification.

This invention relates to typewriting machines of the fan-fold class, such, for example, as the machine disclosed in the patent of IVernery & Smith, No. 1,132,055, dated March 16, 1915. In machines .of this kind a multiple-ply work-web, having a succession of sets of forms printed upon it, is ledinto the machine from a source of supply at the rear, and is fed around the platen line by line. Carbon-carrying blades extend between the plies of web, these blades being mounted upon a carrier or holder which is shifted longitudinally of the web from time to time as the typing of each set of forms is completed to strip the carbons from-the completed set of forms and interleave them with the next set.

-At the line-spacing operation the platen revolves and by means of the usual feedrolls. advances the web together with the carbons. The carbon holder or carrier, which is mounted to slide toward and away from the platen as required, is drawn forward by the web and carbons. Owing to the.

weight of the web and to the weight of the carbon-carrier, the web is apt to slip with reference to the platen pausing the linefeeding to be irregular, especially when the platen is jerked around, as it often is, by reason of too speedy manipulation of the line-space lever, or by reason of the use of an electric motor to return the carriage and operate the line-feeding mechanism.

In accordance with the present invention, this faulty line-feeding of the web, due to the inertia of the plies of the Web and of the carbon-carrier, is prevented by providing means independent of the work-web and carbons for positively advancing the carbon-carrier at the line-spacing of the platen. The carbon-carrier as a result of this arrangement is caused to advance with the,

' work-web and carbons, but'without exerting any substantial tension upon them, and hence there is no tendency of the carboncarrier to make the line-spacing uneven.

carrier to the rear relatively to the work- I web since this would necessitate the rotation of the platen and the gearing connected thereto, and thereby create considerable resistance to the movement of the carbomcarrier without serving any useful purpose. A feature ofthe invention, therefore, is the provision of means for disconnecting the platen and the carbon-carrier at the willof the operator.

It is necessary to release the work-web from the clamp on the carbon-carrier before the carbon-carrier has been thrust to the rear and this release may be effected at the time when the carbon carrier is disconnected from theplaten preparatory to being thrust to the rear; and it is also necessary that the clamp be made effective before any line-spacing of the web has taken place, and this may be done at the time when the platen is again connected to the carboncarrier. In accordance with one feature of this invention, provision is made of common means for controlling both the web-clamp and the connections between the platen and the carbon-carrier, said means preferably comprising a handle movable to release the clamp and to disconnect the platen from the carbon-carrier at a single operation, and a spring for automatically moving the handle to make the clamp effective and for reconnecting the platen and carbon-carrier when the handle is released.

In accordance with one form of the inios able distance beyond the platen in the forward position of the carbon-carrier, where it may be in the way of the operator. To avoid this objection, in the preferred form of the invention an endless perforate belt is provided for driving the carbon-carrier, said belt running upon a pulley at the rear of the carriage-extension and upon a sprocket-wheel which is'fast on the shaft of the platen-driving pinion and is of the same diameter as the pinion. The carbon-carrier is normally connected to advance with the belt by means of a latch having teeth to enter the holes in the belt, andmay be disconnected from it by means of a handle on the carhon-carrier.

The provision of a sprocket-wheel fast on the shaft ofthe platen-driving pinion and of the same diameter as the pinion for driving the belt to advance the carbon-carrier is an important feature of the invention. The sprocket-wheel moves at the same peripheral speed as the platen, and hence advances the carbon-carrier at the speed at which the work-web is line-fed, so that no tension is exerted by the platen upon the work-web, and no slack is produced in the work-web between the carbon-carrier and the platen. The sprocket-wheel does not move bodily at the displacement of the platen, and is located at a convenient height to afford a straight level stretch of belt for connection to, and travel with, the carbon-carrier.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a fragmentary sectional side elevation of the machine embodying the present invention with the parts in the positions occupied during typing.

Figure 2 is'a view similar to Figure 1, but on a smaller scale showing the parts in the positions occupied when the carbon-carrier is moved to the rear, the platen being raised, the platen and carbon carrier being disconnected, and the web-clamp being inefiective.

Figure 3. is a plan view showing the carriage and cariage-extension with the novel mechanism applied thereto.

Fi ure 4 is a view similar to Figure '1 showing a modified form of the invention.

l3igure 5 is a view similar to Figure 2 showing the modified form of the invention.

The invention is shown as applied to an Underwood continuous billing machine of the kind disclosed in the above-mentioned patent to Wernery & Smith, in which typebars (not shown) strike rearwardly against the front of a cylindrical platen 10. The platen is mounted in a swing-frame 11 supported on a carriage 12, which comprises end bars 13 connected to each other by a rear bar it and a front bar- (not shown). The carriage 12 is mounted for letter-feed and return movements upon rails inot nected to travel with the carriage. This frame 23 comprises rails 24; on which a carbon-carrier 25 is mounted to travel toward and from the platen 10. A work-web 26 is led over the carriage-extension 23 from the rear and across the carbon-carrier 25 where the plies of the web become interleaved with carbons 27 carried .by blades 28 on the carhon-carrier, and thence is led forward to and around the platen 10.

The carbon-carrier 25 is drivenforward positively at each line-spacing operation at the same speed at which the Work-web 26 is line-fed by the platen, so that no tension will be exerted upon the work-web which would tend to cause slipping of the web relatively to the platen and result in faulty line-feeding. For this purpose an endless belt 29 having holes 30 is arranged to run upon a pulley 31 mounted on the rear end of the carriage-extension 23, and upon a sprocketwheel 32 fast on the shaft 33 of the platendriving pinion 21. The sprocket-wheel 32 is of the same diameter as the pinion 21, so that it rotates at the same peripheral speed as the pinion. Teeth 34: of the sprocketwheel 32 enter the holes 30 of the belt 29 to drive it. Guide-rolls 35 and 36 are provided for the lower reach of the belt 29 to prevent interference between the belt and other parts of the machine.

The carbonrcari'ier 25 is connected to the belt 29 to be driven by it by means of a latch 37 having teeth 38 arranged to enter a pair of the holes 30 in the belt. The latch 37 is pivoted at 39 upon the handle 40 of the carbon-carrier 25 and has an upwardlyextending arm 41 connected to a releasing handle 42 that extends forwardly along the carbon-carrier handle &0. The releasing handle 42 is guided by means of a headed pin 43 on the carbon-carrier handle 40, received in a slot 44. of the releasing handle. This releasing handle i2 is also connected at its rear end by means of a link 45 to an arm 46 of aweb-cla up 47, pivoted at 48 upon the carbon-carrier a). A spring 4&8", connected to the releasing handle 42 and to the carhon-carrier l indie 40, normally draws the releasing handle to the rear to swing the latch 37 and the clamp 4'2; to their efi'ective positions. The latch 37 and clamp 47 may be simultaneously released by drawing forlltl ward on a finger-piece 49 of the releasing handle." i

At the beginning of typing a set of forms, the carbon-carrier 25 is at the rear of the carriage-extension 23 and the latch 37 and web-clamp 47 are both effective. At each line-spacing operation the sprocket-wheel 32 is rotated in clockwise direction, as seen in Figure 1, and draws the belt 29 forward a distance equal to the peripheral advance of the platen 10. The belt 29 acts through the latch 37 to draw the carbon-carrier 25" forward an equal distance,'and the carboncarrier, in turn, acts through the clamp 47 to draw the portion of the work-web 26 behind the carbon-carrier forward to the same extent. The platen 010 and feed-rolls 50 are therefore required to overcome only the inertia of the portion of the web between the platen and the carbon-carrier 25 which is very slight. When the typing of a set of forms has been completed, the platen is displaced, to permit straightening of the web 26 and carbons 27; the latch 37 and clamp 47 are released by operation of the finger-piece 49; the'web is drawn forward to a gage 51; and the carbon-carrier is thrust to the rear in the usual manner. The belt 29 remains idle during the movement of the carbon-carrier 25 to the rear, but, as soon as the finger-piece 4:9 is released, the belt is reconnected to the carbon-carrier to draw the carbon-carrier forward as the typing of the next set of forms proceeds.

A modified form of the invention is shown in Figures 4 and 5. In this form a horizontal rack52 is mounted on' the carbon- I carrier handle and meshes with the platen-driving pinion 21 to advance the carbon-carrier at the line-spacing operation. The rack 52 may be lifted out of mesh with the pinion 21 when desired, being pivotally supported at 52 and 53 upon arms 54 and- 55 of bell-cranks 56 and 57, pivoted at 58 and 59 on the carbon-carrier handle 40. Arms 60 and 61 of the bell-cranks 56 and 57 are connected to a releasing handle 62, having a finger-piece 63 for drawing it forward to lift the rack 52. The arms5et and 55 ofthe bell-cranks 56 and 57 are parallel and of equal length, and hence form two sides of a parallelogram. The other sides of the parallelogram are the line connectingthe points 52 and 53 at which the arms 54 and .55 are connected to the rack 52 and the line connecting pivots 58 and 59 of the bellcranks. As a result of this arrangement the rack 52 is caused to remain horizontal in any position to which it is lifted, and hence to be raised equally from the pinion 21 at any point ,of its travel. The releasing handle 62, is also connected at its rear end through a link 64.with an arm 65 of a webclamp 66, pivoted at 67 upon the carbon carrier 25. A spring 68 is connected to the released by the operator, and to assure a sufficient clamping pressure upon the workweb 26 by the clamp 66.

The operation of this form of the invention is substantially the same as that of the first-described form. The carbon-carrier 25 is positively advanced by the rack 52 at each line-spacing operation until the typing of a set of forms is completed. The fingerpiece 63 is then actuated to disconnect the rack 52 from the pinion 21, and to render the clamp 66 ineffective, and the carboncarrier 25 is shifted to the rear.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others. Having thus described my invention, I

claim:

1. In a continuous billing typewriting machine, a carriage, a cylindrical platen therein, line-spacing mechanism for the .platen, a rear carriage-extension, a carboncarrier movable toward and from the platen for holding carbons interleaved with plies of a continuous work-web, and means acting independently of the work-web to draw the carbon-carrier forward, whereby tension on relieved of the burden of advancing the carbon-carrier. V

3. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing .mechanism for the platen, and positive" means directly operated by the line-spacing mechanism to advance the carbon-carrier at a rate of speed equal to the peripheral speed of the platen, whereby the carbon-carrier is advanced in unison with the work web but without tensioning the latter.

4. In a continuous billing typewriting inachine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, and positive means directly operated by the line-spacing mechanism to advance the carbon-carrier a distance equal to the peripheral advance of the platen, whereby the carbon-carrier is moved to enable the work-web to be fed around the platen without tension produced by the carboncarrief and without slack being produced in the work-web"between the carbon-carrier and the platen.

5. In a continuous billing typewriting machine for typingv upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, and positive connections between the platen and the carboncarrier for advancing the carbon-carrier equally with the peripheral advance of the platen, whereby slipping of the work-web relatively to the platen due to the inertia of the carbon-carrier is avoided.

6. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable to ward and from the platen, line-spacing mechanism for the platen, positive means directly operated by the linespacing mechanism for advancing the carbon-carrier,

whereby the work-web is relieved ofthe burden of advancing the carbon-carrier, and

a clamp on the carbon-carrier to grip the work-web and cause the portion of the workweb behind the carbon-carrier to be positively advanced with the carbon-carrier.

7. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a displaceable platen-frame mounted therein, a cylindrical platen journaled in the platen-frame, feed-rolls co-opcrating with the platen to feed the web, platen-advancing means comprising a gear on the platen and a pinion constantly in mesh with the gear but not displaceable therewith, the pinion being constructed to rotate at the same peripheral speed as the platen, a rear carriage-extension, a carboncarrier movable upon the carriage-extension toward and from the platen for holding carbons interleaved with the plies of the workweb, and positively-acting connections between the pinion and the carbon-carrier to advance the carbon-carrier linear distances corresponding to the peripheral advances of equally with the peripheral advance of the platen, whereby slipping of the work-web relatively to the platen due to the inertia of the carbon-carrier is avoided, and means for disconnecting the carbon-carrier and the platen to enable the carbon-carrier to be shifted to the rear without rotating the platen.

9. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, positive connections between the platen and the carbon-can rier for advancing the carbon-carrier equally with the peripheral advance of the platen, whereby slipping of the work-web relativelyto the platen due to the inertia of the carbon-carrier is avoided, a clamp on the carbon-carrier to grip the work-web and cause the portion of the work-web behind the carbon-carrier to be positively advanced with the carbon-carrier, means for disconnecting the carbon-carrier and platen, and means for rendering the clamp ineffective, so that the carbon-carrier may be shifted to. the rear to slide the carbons along the Work-Web without rotating the platen.

10. In a continuous billing typewriting 'n'iachine for typing upon a continuous workweb, acarriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, positive connections between the platen and the carboncarrier for advancing the carbon-carrier equally with the peripheral advance of the platen, whereby slipping of the work-web relatively to the platen due to the inertia of the carbon-carrier is avoided, a clamp on the carbon-carrier to grip the work-web and cause the portion of the work-web behind the carbon-carrier to be positively advanced with the carbon-carrier, a handle, and means operated by a single actuation of the handle todisconnect the carbon-carrier and platen and also to render the clamp ineffective, so that the carbon-carrier may be shifted to the rear to slide the carbons along the work-web without rotating the platen.

11. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, positive connections between thefplaten and the carboncarrier for advancing the carbon-carrier equally with the pripheral advance of the platen, whereby slipping of the work-Web, relatively to the platen due to the inertia of the carbon-carrier is avoided, a clamp on the carbon-carrier to grip the work-web and cause the portion of the work-web behind connecting the carbon-carrier and the platen and for simultaneously by the same operat1on rendering the clamp ineflective, so that the carbon-carrier may be shifted to the rear to slide the carbons along the work-Web without rotating the platen.

' 12. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage,. a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, positive connections between the platen and the carbon-carrier for advancing the carbon-carrier equally with the peripheral advance of the platen, whereby slipping of the work-web'relatively to the platen due to the inertia of the carboncarrier is avoided, means for disconnecting the carbon-carrier and the platen to enable the carbon-carrier to be shifted to the rear without rotating the platen, and means to cause the carbon-carrier and platen to be reconnected automatically upon the release of the disconnecting means by the operator. 13. In a continuous billing typewriting machine for typing upon a continuous work- Web, a carriage, a cylindrical platen journaled therein, a carbon-carrier movable toward and from the platen, line-spacing mechanism for the platen, positive connections between the platen and the carboncarrier for advancing the carbon-carrier.

equally with the peripheral advance of the platen, whereby slipping of the work-web relatively to, the platen due to the inertia of the carbon-carrier is avoided, a clamp 'on the carbon-carrier to grip the work-web and cause the portion of the work-web behind the carbon-carrier to be positively advanced with the carbon-carrier, means for disconnecting the carbon-carrier and the platen and for simultaneously by the same operation rendering the clamp ineffective, so that the carbon-carrier may be shifted to the rear to slide the carbons along the work-web without rotating the platen, and means to cause the carbon-carrier and platen to be reconnected automatically upon the release of the disconnecting means by the operator.

14. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon the carriageoxtension toward and from the platen, a handle for moving the carbon-carrier to the rear to shift the carbons along the work web, line-spacing mechanism for the platen, positive connections between the laten and the carbon-carrier for advancing t e carboncarrier without tensioning the work-web, a releasing handle on the carbon-carrier handle, and means operable by the releasing handle to disconnect the platen and carboncarrier to enable the carbon-carrier to be thrust to the rear without driving the platen.

15. In a continuous billing typewriting machine for typing upon a continuous work,

Web, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a

carbon-carrier movable upon the carriage extension toward and from the platen, a handle for moving the carbon-carrier to the rear to shift the carbons alon the work-web, line-spacing mechanism for t e platen, positive connections between the platen and the carbon-carrier for advancing the carbon-carrier without tensioning the work-web, a

web-clamp on the carbon-carrier to cause the web to be advanced with the carbon-carrier, a releasing handle on the carbon-carrier handle, and means operable by the releasing handle to disconnect the platen and carboncarrier and to render the clamp inefiective, thereby to enable the carbon-carrier to be thrust to therear relativel to the work-web and without driving the p aten.

16. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a r aricarriage-extension, a carbon-carrier movable upon the carriageextension toward and from the platen, a handle for moving the carbon-carrier to the rear to shift the carbons along the work-web, linespacing .mechan-ism for the platen, positive connections between the platen and the carbon-carrier for advancing the carboncarrier without tensioning the work-web, a releasing handle on the carbon-carrier handle movable in one direction to disconnect the platen and carbon-carrier to enable the naled therein, a rear carriage-extension, a

carbon-carriage movable upon the carriageextension toward and from the platen, a handle for moving the carbon-carrier to the rear to shift the carbons along the workweb, line-spacing mechanism for the platen, positive connections between the platen and the carbon-carrier for advancing the carbon-carrier without tensioning the workweb, a web-clamp on the carbon-earner to cause the web to be advanced with the carhon-carrier, a releasing handle on the carbon-carrier handle movable in one dlrection to disconnect the platen and carbon-carrier and to render the clam inetfectlve, so that the carbon-carrier may e thrust to the rear relatively to the work-web and wlthoutdriving the platen, and a spring for restoring the releasing handle to its original position when it is released by the operator, thereby to reconnect the platen and carbon-carrier.

18. In a continuous billing typewriting machine for typing upon a continuous Workweb, a carriage, a cylindrical platen jour naled therein, a rear carriage-extension, a

carbon-carrier movable upon the carriageextension toward and from the platen, linespacing mechanism for the connections between the p aten. and carbon-carrier for advancing the carbon-carrier without tensioning the work-web, a webclamp on the carbon-carrier to cause the web to be advanced with the carbon-carrier, means to disconnect the carbon-carrier and platen preparatory to thrusting the carboncarrier to the rear, and. means to compel the release of the web by the web-clamp concurrently with the disconnection of the carbon-carrier and the platen.

19. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon thecarriageextension toward and from the platen, linespacing mechanism for the platen, positive connections between the platen and carboncarrier for advancing the carbon-carrier without tensioning the work-web, a web- .clamp on the carbon-carrier to cause the web to beadvanced'with the carbon-carrier,'the connections between the carbon-carrier and the platen being severable and the webclamp being movable to an ineffective position preparatory to the thrusting of the carbon-carrier to the rear, means to reconnect the carbon-carrier and the platen, and means to compel the restoration of the web clamp to effective position concurrently with the reconnection of the carbon-carrier and the platen.

20. In a continuous billing typewriting machine for typing upon a continuous work-web, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon the carriageextension toward and from the platen, a handle for moving the carbon-carrier to the rear to shift the carbons along the workweb, line-spacing mechanism for the platen, positive connections between the platen and the carbon-carrier for advancing the carbon-carrier without tensioning the workweb, a releasing handle on the carbon-carrier handle movable in one direction to disconnect the rear without driving the platen, a webclamp on the carbon-carrier movable by the releasing handle to ineffective position, and a spring for restoring the releasing handle to its original. position when it is released laten, positive.

laten and carbon-carrier to en able the car on-carrier to be thrust to the by the operator, thereby to reconnect the platen and carbon-carrier and to render the web-clamp effective, said releasing handle having a finger-piece located in position to be moved and held conveniently by the hand that is used in thrusting the carbon-carrier to the rear, so that the clamp may be held in ineffective position until the relative shifting of the carbons and the Work-web has been completed.

21. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a rear carriage-extension a carbon-carrier movable upon the carriageextension toward and from the platen, a handle for moving the carbon-carrier to the rear to shift the carbons along the workweb, line-spacing mechanism for the platen,

positive connections between the platen and the carbon-carrier for advancing the carboncarrier without tensioning the work-web, and a releasing handle on the carbon-carrier handle movable toward the front of the machine to disconnect the platen and carboniently gripped with the carbon-carrier handle and drawn forward against counter pressure exerted upon the carbon-carrier handle.

22. In a continuous billing typewriting machine for typing upon acontinuous work-web, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon the carriageextension toward and from the platen, means for advancing the carbon-carrier to ward the platen witout tensioning the work-web, a web-clamp'on the carbon-carrier, a carbon-carrier handle for thrusting the carbon-carrier to the rear, and a fingerpiece arranged to be gripped with the carhon-carrier handle and to be moved to render theweb-clamp ineffective.

23. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a

carbon-carrier movable upon the carriageextension toward and from the platen, linespacing mechanism for the platen, and an endless belt connecting the platen and the carbon-carrier to advance the carbon-carrier toward the platen without tension on the work-web.

24. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon the carriageextension toward and from the platen, linespacing mechanism for the platen, a sprocket wheel connected to the line-spacing mechanism and arranged to be driven by it, and a perforate belt running upon the sprocket wheel and connected to the carboncarrier to advance the carbon-carrier toward the platen at each line-spacing operation.

25. In a continuous billing typewriting machine for typing upon a continuous work- Web, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon the carriageextension toward and from the platen, linespacing mechanism for the platen, a sprocket wheel connected to the line-spacing mechanism and arranged to be driven by it, an endless perforate belt running upon the sprocket wheel, and a latch on the carboncarrier having teeth to enter the perforations in the belt to connect the carbon-carrier to the sprocket wheel, so that the carbon-carrier will be advanced toward the platen at each line-spacing operation,

26. In. a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a displac'eable platen-frame mounted therein, a cylindrical platen journaled in the platen-frame, platen driving means comprising a ear mounted on the platen. and, displacea le therewith and a non-displaceable platen-driving pinion constantly 1n mesh with the gear on the platen, a rear carriage-extension, a carbon carrier movable upon the carriage-extension toward and from the platen, an endless belt connected to the carbon-carrier, means for guiding the belt, and a sprocket wheel of the same diameter as the platen-driving pinion coaxial with the pinion and arranged to be driven by it. for driving the endless" belt to advance the carbon-carrier equally with the peripheral advance of the platen and without tension on the work-web.

27. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a displaceable platen-frame mounted therein, a cylindrical platen journaled in the platen-frame, platen-driving means comprising a gear mounted on the platen and displaceable therewith and a nondisplaceable platen-driving pinion constantly in mesh with the gear on the platen, a rear carriage-extension, a carbon-carrier movable upon the carriage-extension toward and from the platen, a sprocket wheel of the same diameter as the platen-driving pinion coaxial with the pinion and arranged to be driven in unison with it, a pulley at the rear of the carriage-extension, an endless perforate belt running upon the pulley and sprocket wheel and driven by the sprocket wheel at a rate equal to the peripheral speed of the platen, one of the reaches of the belt extending straight from the pulley to the sprocket wheel parallel to the path of movement of the carbon-carrier, and a latch on the carbon-carrier for connecting the carbon-carrier to the belt to be driven by it.

28. In a continuous billing typewriting machine for typing upon a continuous workweb, a carriage, a cylindrical platen journaled therein, a rear carriage-extension, a carbon-carrier movable upon the carriageextension toward and from the platen, linespacing mechanism for the platen, an endless belt running from the rear to the front of the carriage-extension connected to be driven by the line-spacing mechanism and having one of its reaches extending straight past the carbon-carrier'and parallel to the carboncarrie1"s path, a latch on the carbon carrier for connecting the carbon-carrier to be driven by the belt, a web-clamp on the carbon-carrier, means for operating the latch, and positive connections between the v latch and web-clamp to compel the latch and clamp to be rendered effective concurrently and to be rendered ineffective concurrently.

25). In a continuous billing typewriting machine for typing upon a continuous workweb, acarriage, a cylindrical platen journaled therein, platen-driving means comprising a gear on the platen and a pinion in mesh with the gear, a rear carriage-extension, a carbon-carrier mounted on the carriage-extension for movement toward and from the platen, means connecting the pinion and the carbon-carrier to advance the carbon-carrier toward the platen, and means to disengage the pinion and said connecting means at the will of the operator.

' JESSE A. B. SMITH. 

